What do you get on the screen if you have only one ribbon cable connected one at a time between T-CON and the tab boding board?
BTW, pictures are too out of focus to see Voltage test points on that T-CON board.

Had two of this model both with the issues you describe in the last couple of months both were caused by faulty main boards. In both instances a replacement main board resolved the problem.Also from what I remember the 49" board will also work with no adjustments.
Hope this helps.

I think its the screen but any advice would be appreciated. I changed the main board still has the same symptoms. i.e No picture (the replacement board was out of a broken 49ub850v screen tv with a display).

I think its the screen but any advice would be appreciated. I changed the main board still has the same symptoms. i.e No picture (the replacement board was out of a broken 49ub850v screen tv with a display).

T-CON board is dead, it has 12V feeding it but lots of Voltages are really really low. Do you get the same readings if the cables between T-CON and LCD panel are removed. The board may not be compatible with your screen, also can be bad panel that causes lots of Voltages on T-CON to be low.

T-CON board is dead, it has 12V feeding it but lots of Voltages are really really low. Do you get the same readings if the cables between T-CON and LCD panel are removed. The board may not be compatible with your screen, also can be bad panel that causes lots of Voltages on T-CON to be low.

+10 Bad panel sorry to say. With 12V supply coming in and getting only mV on several of those test points, it would appear that either the T-CON is not working as previously stated or the Panel. I suspect the Panel though.